Improved AR-FGS Coding Scheme for Scalable Video Coding 


Vol. 31,  No. 12, pp. 1173-1183, Dec.  2006


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  Abstract

In this paper, we propose an efficient method for improving visual quality of AR-FGS (Adaptive Reference FGS) which is adopted as a key scheme for SVC (Scalable Video Coding) or H.264 scalable extension. The standard FGS (Fine Granularity Scalability) adopts AR-FGS that introduces temporal prediction into FGS layer by using a high quality reference signal which is constructed by the weighted average between the base layer reconstructed imageand enhancement reference to improve the coding efficiency in the FGS layer. However, when the enhancement stream is truncated at certain bitstream position in transmission, the rest of the data of the FGS layer will not be available at the FGS decoder. Thus the most noticeable problem of using the enhancement layer in prediction is the degraded visual quality caused by drifting because of the mismatch between the reference frame used by the FGS encoder and that by the decoder. To solve this problem, we exploit the principle of cyclical block coding that is used to encode quantized transform coefficients in a cyclical manner in the FGS layer. Encoding block coefficients in a cyclical manner places ‘higher-value’ bits earlier in the bitstream. The quantized transform coefficients included in the ealry coding cycle of cyclical block coding have higher probability to be correctly received and decoded than the others included in the later cycle of the cyclical block coding. Therefore, we can minimize visual quality degradation caused by bitstream truncation by adjusting weighting factor to control the contribution of the bitstream produced in each coding cycle of cyclical block coding when constructing the enhancement layer reference frame. It is shown by simulations that the improved AR-FGS scheme outperforms the standard AR-FGS by about 1 dB in maximum in the reconstructed visual quality.

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  Cite this article

[IEEE Style]

K. Seo, S. Jung, J. Kim, J. Kim, "Improved AR-FGS Coding Scheme for Scalable Video Coding," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 12, pp. 1173-1183, 2006. DOI: .

[ACM Style]

Kwang-deok Seo, Soon-heung Jung, Jin-soo Kim, and Jae-gon Kim. 2006. Improved AR-FGS Coding Scheme for Scalable Video Coding. The Journal of Korean Institute of Communications and Information Sciences, 31, 12, (2006), 1173-1183. DOI: .

[KICS Style]

Kwang-deok Seo, Soon-heung Jung, Jin-soo Kim, Jae-gon Kim, "Improved AR-FGS Coding Scheme for Scalable Video Coding," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 12, pp. 1173-1183, 12. 2006.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880